(20 U.S.C. 6301 et. seq.), as amended by this Act, from programs. authorized under the Elementary and Secondary Education Act. of 1965 (20 U.S.C. 6301 et seq.), as in effect on the day before. the date of enactment of this Act.
The efficacy of a vaccine is different from its effectiveness. It is dependent on several factors such as: 1  adherence to vaccine schedules. 2  the disease â some diseases have vaccines against them that perform better than for other diseases. 3  the strain of vaccine â some vaccine strains are more effective than others.
This vaccine is used to prevent infection by the influenza (flu) virus. It is also called the seasonal flu shot. Influenza can cause serious illness (rarely death), especially in people at high risk from the infection (such as young children, the elderly, and people with chronic health problems). Vaccines work by causing the body to produce its own protection (antibodies) against the virus.